Based on the official IEC 60364-5-55 (Edition 2.0, 2016 – including Amendment 1, 2021), here are the most cited rules from Clause 551:
IEC standards are copyrighted; obtain the official IEC 60364-5-51 PDF through: iec 60364 part 551 pdf
The primary goal is to prevent hazards such as back-feed into de-energized utility lines (endangering line workers), overvoltages, incorrect phase sequence, and inadequate earth fault protection. Based on the official IEC 60364-5-55 (Edition 2